Electronics Forum | Fri Mar 03 06:41:09 EST 2000 | jacqueline coia
I have tried the IPC calculator and they do not have this type of component registered. When trying to select 'other' on menu, no connection can be made. The polarity if the QFP has not been decided yet (pre-PCB design) the pitch size of the componen
Electronics Forum | Tue Sep 18 12:10:39 EDT 2007 | wailiang81
Hi, good day to all. This is my 1st question post in this forum. Hope able to share some knowledge here. As we know QFP area like 0.4mm pitch was a very critical area to control especially those PCB using silkscreen printing process manufactured. Onc
Electronics Forum | Thu Aug 26 07:35:32 EDT 1999 | Robert Meston
For space contracts we have to mount chip capacitors/ resistors etc 0.1 to 0.4 mm from the pad height. This is to compenstae for the CTE differential in the substrate/component and also to ensure cleanliness. Does anyone have any new ideas on how t
Electronics Forum | Fri Apr 17 14:37:13 EDT 1998 | Justin Medernach
| We have to mount our SMD devices 0.1 to 0.4 mm off the pcb | PCb substrate to compensate for thermal stressing in a | Space enviroment. Has any one any ideas or contacts for | dissolvable pads. this only applies to leadless components Robert, Try
Electronics Forum | Thu Jul 25 07:44:18 EDT 2002 | krs
Dennis thanks for the feedback. I can confirm we have also had 'black pad' type problems on gold pcbs fitted with BGAs. It can be as you say impossible to detect on Xray. We try to avoid gold pcbs for this reason, preferring horizontal HASL even whe
Electronics Forum | Fri Mar 02 00:21:38 EST 2007 | AMS
Hello, I havea 0.4mm pitch TQFP with heat transfer pad on the bottom side of component. I will appreciate any suggestions with regards to: 1) stencil thickness (Rest of components on board are 0603 passives and few 40 mil pitch IC's) 2) Stencil
Electronics Forum | Thu May 03 01:07:18 EDT 2007 | pavel_murtishev
Good morning, Worth system for 0.5mm or more pitch paste printing. For less pitch (uBGA, 0.4mm etc) framed stencil are preferred due to better tensioning. Main issue with them is handling. Stencil apertures that are used for tensioning might be easi
Electronics Forum | Fri Feb 22 09:10:51 EST 2008 | mulder0990
AJ, You can use 0402 feeders to place the 0201 parts. I would suggest getting the feeders you are going to use calibrated before trying to run the parts. Also, another good idea is to get some 0.4mm tape leaf covers for the feeders. They will h
Electronics Forum | Mon Mar 17 20:50:34 EDT 2008 | keithej2
SMT Research has offered to sell us 0.4mm nozzles for tests. Even if the camera worked with the nozzles and parts (which I doubt) I don't think the CP4 has the x-y accuracy to place 0201s well. We'll see, they are ordering the nozzles, test parts and
Electronics Forum | Wed Aug 27 11:09:55 EDT 2008 | fede
I�m interested in the F1 model, due to the possibility of this system to be configured with 1 top camera and 4 side. We are manufacturing 0402 and 0.4mm fine pitch Lead Free, and our PCB�s quality is not very good. With just one camera are you able t
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